LM293D データシートの表示（PDF） - Motorola => Freescale
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LM293D Datasheet PDF : 6 Pages
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LM393, LM393A, LM293, LM2903, LM2903V
APPLICATIONS INFORMATION
These dual comparators feature high gain, wide
bandwidth characteristics. This gives the device oscillation
tendencies if the outputs are capacitively coupled to the
inputs via stray capacitance. This oscillation manifests itself
during output transitions (VOL to VOH). To alleviate this
situation, input resistors < 10 kΩ should be used.
The addition of positive feedback (< 10 mV) is also
recommended. It is good design practice to ground all
unused pins.
Differential input voltages may be larger than supply
voltage without damaging the comparator’s inputs. Voltages
more negative than –0.3 V should not be used.
Figure 7. Zero Crossing Detector
(Single Supply)
+15 V
R1
R4
R5
8.2 k
Vin R1
D1
220 k
6.8 k
R2
220 k
*
)LM393
10 k
15 k
10 M
R3
D1 prevents input from going negative by more than 0.6 V.
R1 + R2 = R3
R3 ≤
R5
10
for small error in zero crossing.
Figure 8. Zero Crossing Detector
(Split Supply)
Vin
Vin(min)
+VCC
Θ
*
10 k
Vin
)LM393
VCC
–VEE
VO
– VEE
Θ
∆Θ
[ Vin(min) 0.4 V peak for 1% phase distortion (∆Θ).
Figure 9. Free–Running Square–Wave Oscillator
1.0 MΩ
VCC
Figure 10. Time Delay Generator
VCC
VCC
VCC
51 k
–
0.001 µF LM393
+
RL
10 k
VO
t
R
RL
–
–
LM393
LM393
+
VC C
+
VO
51 k
VCC
51 k
VO
0
t
‘‘ON’’ for t tO + ∆t
where:
+ Vref
Vin Vref
ȏ ∆t = RC
n
(
Vref
VCC
)
0
VO
0
VC Vref
0
tO
ȏ
t
Figure 11. Comparator with Hysteresis
VCC
RS
R1
Vref
–
LM393
+
R2
RS = R1 | | R2
RL
Vth1
=
Vref
+
(VCC –Vref) R1
R1 + R2 + RL
Vth2 = Vref –
(Vref –VO Low) R1
R1 + R2
MOTOROLA ANALOG IC DEVICE DATA
5
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